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i i . TABLE 1 Groundwater Monitoring Data Former Beacon Station No 12419 2350 Waterloo Road,Stockton, California ethyl- Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (ug/L) (ug1L) (ug1L) (uglL) (ug1L) (uglL) (uglL) (ug1L) (uglL) (ug/L) (ug1L) (uglt.) (ugIL) (ug1L) (feet) (feet sea level) (feet sea level) Comments MW-9 11/12/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2065 wellhead survey -24 94 slight odor!no sheen screened 12/30/98 1500 73 18 160 64 <25 0 na na na na na na na na 4559 -2074 n0 odor 1 no sheen interval 03/26/99 1300 54 58 110 15 <0 50 <0 50 <0 50 <0 50 11 <50 <5 0 na na 4139 4V-66' 06102199 1300 16 25 76 24 <0 50 <0 50 <0 50 <0 50 13 <50 <5 0 16 <0 50 4074 -2009 no odor!no sheen 08!31/99 2400 140 21 460 280 055 <0 50 <0 50 <0 50 93 <50 <50 42 <0 50 4562 2497 no comment 12109/99 1600 86 65 200 62 079 <0 50 <0 50 <0 50 10 <50 <5 0 13 <0 50 4726 -2661 02121100 1900 50 18 100 60 055 <0 50 <0 50 <0 50 10 <50 88 95 <0 50 4581 -2516 slight odor 1 no sheen 05/18/00 790 96 081 76 21 <0 50 <0 50 <o 50 <0 50 12 <50 <5 0 na na 4089 2024 slight odor 1 no sheen 09126!00 68D 1 1 <0 50 31 087 <5 0 na na na na na na na na 4895 -2830 slight odor!no sheen 12/21/00 1400 16 1 1 40 120 <5 0 na na na na na na na na 4762 2697 slight odor 1 no sheen 03/27101 1700 81 14 23 220 <5 0 na na na na na na na na 4637 -2572 slight odor 1 no sheen <0 50 <0 50 <0 50 <0 50 8 5 <50 <50 68 <0 50 4899 -2834 slight odor 1 no sheen 06/26/01 390 5 1 0 85 4 4 27 33 46 no odor 1 no sheen 09/05/01 410 1 1 <0 50 <0 50 46 <5 0 na na na na na na na na 5411 20 87 wellhead survey MW-10 12102198 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2497 no odor 1 no sheen screened 12/30198 180 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4564 <0 50 <0 50 0 72 <0 50 <0 50 <0 50 <0 50 9 2 <50 <5 0 na na 41 65 -2078 no odor/no sheen interval 03!26199 140 064 2009 no odor!no sheen 41'-66' 06/02/99 160 <0 50 <0 50 CO 50 <0 50 <0 50 <0 50 <0 50 <0 50 12 <5o <50 94 <0 50 4096 08/31/99 120 -Co 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 93 <50 <5 0 65 <0 50 4574 -2487 no comment 12109199 56 CO 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 e50 <60 <50 26 <0 50 4746 -2659 no comment <5 0 3 3 <0 50 45 91 -25 04 no odor 1 no sheen <0 50 <0 50 <0 50 <5 0 <50 02121100 55 <D 50 <0 50 <0 50 <0 50 <D 50 _Y0 24 no odorina sheen 05/18/00 <50 <0 50 31 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 na na 41 11 nm well access blocked 09126/00 ns ns ns AS ns ns ns ns ns ns ns ns ns ns nm -2702 no odor!no sheen 12120100 <50 <0 50 70 <0 50 <0 60 <5 0 na na na na na na na na 4789 03!27101 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4762 2675 no odor 1 no sheen 06/26/01 <50 <0 50 <0 50 <0 50 <0 5D <0 50 <0 50 <0 50 <0 50 <50 <50 <50 <0 50 <0 50 4905 -2818 no odor 1 no sheen 09/05/01 <50 <0 50 14 <0 5D <0 50 <5 0 na na na na na na na na 5405 -3318 no odor!no sheen IIIIYIf-11 1012W00 240 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 14 <50 130 --j3-<o 50 49 25 2057 -2868 wellhead survey < <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4759 -2702 no odor 1 no sheen screened 12/21/00 300 0 50 -2574 no odor!no sheen interval 03/27/01 190 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 46 31 <0 50 <0 SD <0 50 1 5 <0 50 <0 50 <0 50 <0 50 12 <50 17 16 <0 50 4882 2625 no odor 1 n0 sheen 30'-50 06!26101 160 well dry 09105101 ns ns ns ns ns ns ns n$ ns ns ns ns ns ns nm nc I 419gm41 Mie Page 5 of 7 HORIZON 81f17I WNMENTAL IKC 141944